EP 1248157 A2 20021009 - Toner and image forming apparatus
Title (en)
Toner and image forming apparatus
Title (de)
Toner und Bildherstellungsgerät
Title (fr)
Révélateur et appareil de formation d' images
Publication
Application
Priority
- JP 2001104720 A 20010403
- JP 2001104721 A 20010403
- JP 2001104722 A 20010403
Abstract (en)
The object is to prevent the occurrence of the selective consumption development. The first aspect of the invention is a toner being characterized in that the medium-resistance external additive coating ratio of toner particles of which mother particles have equivalent particle diameters smaller than an equivalent particle diameter of a mother particle diameter equal to the mean particle diameter of the toner is set to be higher than a virtual reference curve in synchronous distribution of the equivalent particle diameters of synchronous medium-resistance external additive particles relative to the equivalent particle diameters of mother particles, wherein assuming that the medium-resistance external additive coating ratio of a toner particle of which a mother particle has an equivalent particle diameter equal to the roughness of a developing roller or the mean particle diameter of the toner is a reference value, the virtual reference curve is obtained to satisfy that the medium-resistance external additive coating ratio is constant at the reference value. The second aspect of the invention is a toner being characterized in that the medium-resistance external additive coating ratios of toner particles in a range in which mother particles have equivalent particle diameters smaller than d1 and in a range in which mother particles have equivalent particle diameters larger than d2 are set to be higher than a virtual reference curve in synchronous distribution of the equivalent particle diameters of synchronous medium-resistance external additive particles relative to the equivalent particle diameters of mother particles, wherein assuming that the medium-resistance external additive coating ratio of a toner particle with a diameter between d1 and d2 is a reference value wherein d1 is an equivalent particle diameter of a mother particle equal to the roughness of the developing roller and d2 is an equivalent particle diameter of a mother particle diameter equal to the mean particle diameter of the toner (d1<d2), the virtual reference curve is obtained to satisfy that the medium-resistance external additive coating ratio is constant at the reference value. The third aspect of the invention is a toner being characterized in that the medium-resistance external additive coating ratio of toner particles in a range in which mother particles have equivalent particle diameters larger than the roughness of the developing roller or than an equivalent particle diameter of a mother particle diameter equal to the mean particle diameter of the toner is set to be higher than a virtual reference curve in synchronous distribution of the equivalent particle diameters of synchronous medium-resistance external additive particles relative to the equivalent particle diameters of mother particles, wherein assuming that the medium-resistance external additive coating ratio of a toner particle of which a mother particle has an equivalent particle diameter equal to the roughness of a developing roller or the mean particle diameter of the toner is a reference value, the virtual reference curve is obtained to satisfy that the medium-resistance external additive coating ratio is constant at the reference value. The fourth aspect of the invention is an image forming apparatus comprising a photoreceptor on which an electrostatic latent image is formed, a developing unit for developing the electrostatic latent image on the photoreceptor with a toner, a transfer means for transferring the developed image on the photoreceptor, and a fusing means for fusing the transferred image, the image forming apparatus being characterized in that said toner is a toner of any one of the aforementioned aspects. <IMAGE>
IPC 1-7
IPC 8 full level
G03G 9/08 (2006.01); G03G 13/08 (2006.01)
CPC (source: EP US)
G03G 9/0819 (2013.01 - EP US); G03G 9/0821 (2013.01 - EP US); G03G 13/08 (2013.01 - EP US); G03G 2215/0177 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
DOCDB simple family (publication)
EP 1248157 A2 20021009; EP 1248157 A3 20030813; CN 100392519 C 20080604; CN 1379290 A 20021113; TW 583520 B 20040411; US 2003003386 A1 20030102; US 6821701 B2 20041123
DOCDB simple family (application)
EP 02007579 A 20020403; CN 02108578 A 20020403; TW 91106726 A 20020403; US 11395102 A 20020402